[6.0] Fix deprecated message in messages - my settings

[chmst]

Pull Request for Issue #
see https://forum.joomla.de/thread/23070-e-mail-benachrichtigung-bei-neuen-nachrichten/?postID=176266#post176266

Note: The issue does not exist in 5.4.

Summary of Changes

Define $item as \stdClass().

Testing Instructions

On a J6.0 with PHP 8.3 or 8.4 set debug-modus on and error-reporting to "maximum"
Go to Users - messages - private messaging, Click the Settings-Button top left.

Actual result BEFORE applying this Pull Request

Change Settings, new Settings are not stored.

Expected result AFTER applying this Pull Request

No deprecated messages, Settings are stored correctly

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[ChristineWk]

I have tested this item ✅ successfully on a875028

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/46475.}

[CMS-Manufaktur]

I have tested this item ✅ successfully on a875028

Test after modifying the file was successful. The error messages disappear and the settings are saved.

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/46475.}

[richard67]

System tests are failing. All failures belong to test script site/components/com_privacy/Request.cy.js and are related to privacy requests.